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Tu agis vite.

Tu agis vite.
You are acting quickly.
From Lesson 63:Regular -ir verbs (choisir, finir)·French

Questions & Answers about Tu agis vite.

What is the infinitive of agis and how does its conjugation work here?
agis comes from the verb agir (to act), which is a regular -ir verb. To conjugate it for tu (you), you drop the -r from the infinitive to get the base agi- and then add the ending -s, making it tu agis.
Do I pronounce the s at the end of agis?
No, the s is silent. You pronounce it simply as "ah-jee". In French, most final consonants like s are silent unless they link to a vowel at the start of the next word.
The translation says "are acting", but isn't there an "-ing" form in French?
French does not have a separate continuous tense like English does. The simple present tense tu agis translates to both "you act" (in general) and "you are acting" (right now in the moment).
Could I say Tu agis rapide instead of Tu agis vite?
No, you must use vite. rapide is an adjective meaning "quick" and is used to describe nouns (like a quick person or a quick car). vite is an adverb meaning "quickly" or "fast", which describes how an action is performed. Since you are describing how you act (agis), you need vite.

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